HP Compaq Presario,Presario 4400 Hardware Reference Manual page 38

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Hardware Reference Guide
1. Open both latches of the memory module socket.
Opening the Latches on the Memory Module Socket
If you are replacing a memory module, put the new memory module
in the same memory slot from which the old memory was removed.
If you are adding a memory module, install the new module into the
socket nearest the preinstalled module, and install additional modules
in the next available sockets.
Computer Upgrades
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